diff options
| author |   Thomas Gleixner <tglx@linutronix.de> | 2021-10-15 03:16:17 +0200 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2021-10-20 22:17:17 +0200 |
| commit | bf5d00470787067ff27593c6a097b5eb6e01168e (patch) | |
| tree | 8207849b57070ee84d66fe62075763fb7f87f895 /arch/x86/kernel/fpu/core.c | |
| parent | x86/fpu: Provide a proper function for ex_handler_fprestore() (diff) | |
| download | wireguard-linux-bf5d00470787067ff27593c6a097b5eb6e01168e.tar.xz wireguard-linux-bf5d00470787067ff27593c6a097b5eb6e01168e.zip | |
x86/fpu: Replace KVMs home brewed FPU copy to user
Similar to the copy from user function the FPU core has this already
implemented with all bells and whistles.
Get rid of the duplicated code and use the core functionality.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: kvm@vger.kernel.org
Link: https://lkml.kernel.org/r/20211015011539.244101845@linutronix.de
Diffstat (limited to 'arch/x86/kernel/fpu/core.c')
| -rw-r--r-- | arch/x86/kernel/fpu/core.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c index 79f2e8ddd10c..ac540a7d410e 100644 --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -184,6 +184,24 @@ void fpu_swap_kvm_fpu(struct fpu *save, struct fpu *rstor, u64 restore_mask) } EXPORT_SYMBOL_GPL(fpu_swap_kvm_fpu); +void fpu_copy_fpstate_to_kvm_uabi(struct fpu *fpu, void *buf, + unsigned int size, u32 pkru) +{ + union fpregs_state *kstate = &fpu->state; + union fpregs_state *ustate = buf; + struct membuf mb = { .p = buf, .left = size }; + + if (cpu_feature_enabled(X86_FEATURE_XSAVE)) { + __copy_xstate_to_uabi_buf(mb, &kstate->xsave, pkru, + XSTATE_COPY_XSAVE); + } else { + memcpy(&ustate->fxsave, &kstate->fxsave, sizeof(ustate->fxsave)); + /* Make it restorable on a XSAVE enabled host */ + ustate->xsave.header.xfeatures = XFEATURE_MASK_FPSSE; + } +} +EXPORT_SYMBOL_GPL(fpu_copy_fpstate_to_kvm_uabi); + int fpu_copy_kvm_uabi_to_fpstate(struct fpu *fpu, const void *buf, u64 xcr0, u32 *vpkru) { |